3.International demand for black rhinos horn has seen the animals killed cruelly for decades in countries such as Namibia,Zimbabwe and South Africa.In 1960 there were an estimated 100,000 left,and by 1995 fewer than 2,500 remained.Conservation efforts have brought the number up to around 5,600 today,but the species is still critically endangered,and poaching(非法捕獵)is among its biggest threats.
Scientists have worked to protect these rare creatures by tracking them with GPS devices tied to their necks or ankles or implanted in their horns.The resulting data let researchers monitor the rhinos'numbers and when they enter poaching hot spots.But the devices can fail,and drugging the animals to attach them may cause harm.
A recent study describes a new tracking technology that uses smart phones to record rhino footprints.Called the footprint-identification technique (FIT),this system includes software that can analyze the animals'movements from a distance to help keep them safe from poachers.The idea came from working with local trackers in Zimbabwe.These footprint-reading experts can identify individual black rhinos from the shape of their feet and,when visible,the impressions left by cracks in the animals'heel pads,which are as distinctive as a human fingerprint."We probably wouldn't even have looked at the footprints in the first place if we didn't have local trackers,"says Sky Alibhai,co-founder of WildTrack.
To use the system,scientists gather rhino footprint images with a smart phone application and upload the pictures to a global database.FIT software analysis can then identify the individual animal and determine its age and sex with up to 99 percent accuracy.Researchers can also estimate the number of black rhinos in an area and watch their movements.
Researchers have adapted the technology for diverse animals,including African lions,Bengal tigers."I think this is great for monitoring animals and counting individuals,"says Ciska Scheijen,a conservation scientist in South Africa.He wonders about FIT's performance during the rainy season,when footprints are often indistinct,and if it can track larger herds as opposed to the 35–odd individuals this study monitored.
(1)What is mainly described in Paragraph 1?
A.Illegal hunting is on the rise.
B.Black rhinos horn is a major business.
C.Black rhinos are at risk of extinction.
D.Conservation efforts are getting nowhere.
(2)What is the function of FIT?
A.To check rhino footprints.
B.To analyze black rhinos'daily routines.
C.To keep track of black rhinos for their safety.
D.To monitor the rhinos'numbers at poaching spots.
(3)What does Ciska Scheijen think of FIT?
A.It may fail with footprints unclear.
B.It will monitor animals on rainy days.
C.It can be used for tracking larger herds.
D.It can track other animals besides rhinos.
(4)Which of the following might be the best title for the passage?
A.How Does the Tracking System Work?
B.Why Are Black Rhinos Endangered?
C.Measures Are Taken to Protect Black Rhinos.
D.New App Tracks Black Rhinos Through Footprints.